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M setting is for the M button on the steering wheel. While you are driving and if you are in a playful mood you can make use of the settings by pressing the M button.
M Key setting is, when you start the car with a particular key, the setting store are your default settings. That way you don't need to change the settings every time you get in the car. These are only dynamic - suspension and chassis settings. Hope this is explained.
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F86 X6///
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